Comparison of ionically and ionical-covalently cross-linked polyaromatic membranes for SO₂ electrolysis

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• 作者：Retha Peach ; Henning M. Krieg ; Andries J. Kr眉ger ; Derik van der Westhuizen ; Dmitri Bessarabov ; Jochen Kerres
• 关键词：PBI based blend membranes ; H2SO4 stability ; HyS electrolysis
• 刊名：International Journal of Hydrogen Energy
• 出版年：2 January, 2014
• 年：2014
• 卷：39
• 期：1
• 页码：28-40
• 全文大小：2428 K

文摘

It has been shown that hydrogen, which can be used for energy storage, can be produced efficiently by the membrane based Hybrid Sulfur (HyS) process. During the HyS electrolysis step, SO₂ and H₂O are converted to H₂ and H₂SO₄, which implies that membranes to be used for this process should have both a high proton conductivity and acid stability. In this study ionic and ionic-covalently cross-linked polybenzimidazole (PBI) blended membranes were investigated and compared with Nafion^庐212 in terms of their acid stability. Characterization of the membranes, which included monitoring the change in weight, swelling, SEM/EDX, TEM, TGA-MS, FTIR and IEC before and after H₂SO₄ treatment showed that all tested membranes were stable in 80聽wt% H₂SO₄ at 80聽掳C for 120聽h. Subsequent HyS electrolysis showed that the blend membranes performed better than Nafion^庐115 at current densities below 0.3聽A/cm², while performing similar above 0.3聽A/cm².